Hi Rez Orbits

This is a simple little Basic program that enables drawing of elliptic orbits to illustrate planetary motion. I wrote it to show that Newton's universal law of gravitation does in fact lead to stable orbits. There are probably easier equations to use, but this is very fundamental. As will be seen by the remarks after the program listing, this is not really suitable for Basic. I must now bestir myself and have another crack at machine language. The program requires high-resolution graphics, and...

Configuring A S Meg Hard Drive

Model 4 LS-DOS 6.3.x and Model 3 LDOS 5.x.x When I recently offered one of my Radio Shack 5 meg hard drives for sale, I thought the right thing to do would be to reconfigure it from scratch. This, of course, meant partitioning the drive, and then in turn formatting each partition individually. Following this, I'd need to install the DOS and make the first partition the SYSTEM drive. If you're new to working with hard drives, the step-by-step description which follows may be of interest. If...

The Fourth Ldos Partition

Finally, the most important partition for LDOS. This one will end up being the system drive. First, let's partition it by typing SYSTEM drive 5, disable, driver RSHARD 5 After the header and copyright notice appears, the prompt is once again Enter drive address lt l-2 gt and F R 1 F - gt Same answer as before press lt ENTER gt to The next prompt is Enter partition's number of cylinders 153 - gt Chose the default of 153 cylinders by pressing lt ENTER gt . There is no 'unformatted' warning, and...

System

Partition 4 - LDOS partition 2 - empty partition 3 - empty partition 1 - LS-DOS LDOS whatever The 5 meg hard drive is at this point capable of running LS-DOS and LDOS. It is indeed quite handy. However, in order to get from LS-DOS to LDOS it is necessary to insert the LDOS boot disk in drive 0 and reboot. There is a better way. Roy Beck wrote an article in TRSTimes 5.1 Jan Feb 1992 about a program called BOOT5 CMD. The author, Alan Rubin, wrote it for LDOS 5.3.0, and we patched it to work with...